body{
    padding: 0px;
    margin: 0px;
}

/*顶部*/
.nav-bar {
    width: 100%;
    height: 30px;
    border-bottom: 2px solid red;
    background-color: red;
    padding: 10px 0;
    text-align: center;
}

/*身体*/
.center{
    width: 60%;
    margin: auto;
}

.center li{
    margin-left: 150px ;
    margin-bottom: 20px ;
}



/*结尾*/
.bottom{
    width: 100%;
    margin: auto;
    border-top: 2px solid #333333;
    text-align: center;
    margin-top: 30px ;
    /*margin-bottom: 50px;*/
    background: red;
}



